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drm/radeon/dp: sleep after powering up the display 

According to the DP 1.1 spec, the sink must power
up within 1ms.  Noticed while reviewing Thierry's
drm/dp patches.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Alex Deucher 2014-01-14 10:45:51 -05:00
parent ab9f51c09f
commit d30df55b3e
1 changed files with 3 additions and 1 deletions
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4
drivers/gpu/drm/radeon/atombios_dp.c
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@ -673,9 +673,11 @@ static int radeon_dp_link_train_init(struct radeon_dp_link_train_info *dp_info)
u8 tmp;
/* power up the sink */
if (dp_info->dpcd[0] >= 0x11)
if (dp_info->dpcd[0] >= 0x11) {
radeon_write_dpcd_reg(dp_info->radeon_connector,
DP_SET_POWER, DP_SET_POWER_D0);
usleep_range(1000, 2000);
}
/* possibly enable downspread on the sink */
if (dp_info->dpcd[3] & 0x1)